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<p>[QUOTE=&quot;Numbers, post: 1088626, member: 11668&quot;]Yes, they detect the starch in the paper.&nbsp; The trouble is that the old 18-subject sheets (dated 1953 and earlier) were wet-printed, and there was apparently some starch/sizing in the water that was used to dampen the sheets.&nbsp; That&#039;s enough to make them test as fake to these pens.</p><p>&nbsp;</p><p>Likewise, a modern note that has been through a laundry cycle with starch will generally fail the pen test.&nbsp; I even heard of one guy who liked to use spray starch on his currency, precisely to mess with cashiers who used the pens!</p><p>&nbsp;</p><p>When I&#039;ve personally seen these pens for sale in office supply stores, the packaging said that the pen would work on all currency printed since &quot;Series 1959&quot;.&nbsp; Of course, there is no such series, so I&#039;m not sure what they meant by that.&nbsp; Series 1957 was the first to be dry-printed, so at least in theory the pens should work on it....&nbsp; But I never cared enough about this question to sacrifice any silver certificates to the experiment.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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